// pages/signature/signature.js
Page({
  /**
   * 页面的初始数据
   */
  data: {
    loading: false,
    canvasName: 'handWriting',
    ctx: '',
    canvasWidth: 0,
    canvasHeight: 0,
    transparent: 1, // 透明度
    selectColor: 'black',
    lineColor: '#1A1A1A', // 颜色
    lineSize: 1.5, // 笔记倍数
    lineMin: 0.5, // 最小笔画半径
    lineMax: 4, // 最大笔画半径
    pressure: 1, // 默认压力
    smoothness: 60, //顺滑度，用60的距离来计算速度
    currentPoint: {},
    currentLine: [], // 当前线条
    firstTouch: true, // 第一次触发
    radius: 1, //画圆的半径
    cutArea: { top: 0, right: 0, bottom: 0, left: 0 }, //裁剪区域
    bethelPoint: [], //保存所有线条 生成的贝塞尔点；
    lastPoint: 0,
    chirography: [], //笔迹
    currentChirography: {}, //当前笔迹
    linePrack: [], //划线轨迹 , 生成线条的实际点
    state: '', //跳转页面状态
  },

  /*======所有自定义函数======*/

  // 笔迹开始
  uploadScaleStart(e) {
    if (e.type != 'touchstart') return false
    let ctx = this.data.ctx
    ctx.setFillStyle(this.data.lineColor) // 初始线条设置颜色
    ctx.setGlobalAlpha(this.data.transparent) // 设置半透明
    let currentPoint = {
      x: e.touches[0].x,
      y: e.touches[0].y,
    }
    let currentLine = this.data.currentLine
    currentLine.unshift({
      time: new Date().getTime(),
      dis: 0,
      x: currentPoint.x,
      y: currentPoint.y,
    })
    this.setData({
      currentPoint,
      // currentLine
    })
    if (this.data.firstTouch) {
      this.setData({
        cutArea: { top: currentPoint.y, right: currentPoint.x, bottom: currentPoint.y, left: currentPoint.x },
        firstTouch: false,
      })
    }
    this.pointToLine(currentLine)
  },
  // 笔迹移动
  uploadScaleMove(e) {
    if (e.type != 'touchmove') return false
    if (e.cancelable) {
      // 判断默认行为是否已经被禁用
      if (!e.defaultPrevented) {
        e.preventDefault()
      }
    }
    let point = {
      x: e.touches[0].x,
      y: e.touches[0].y,
    }

    //测试裁剪
    if (point.y < this.data.cutArea.top) {
      this.data.cutArea.top = point.y
    }
    if (point.y < 0) this.data.cutArea.top = 0

    if (point.x > this.data.cutArea.right) {
      this.data.cutArea.right = point.x
    }
    if (this.data.canvasWidth - point.x <= 0) {
      this.data.cutArea.right = this.data.canvasWidth
    }
    if (point.y > this.data.cutArea.bottom) {
      this.data.cutArea.bottom = point.y
    }
    if (this.data.canvasHeight - point.y <= 0) {
      this.data.cutArea.bottom = this.data.canvasHeight
    }
    if (point.x < this.data.cutArea.left) {
      this.data.cutArea.left = point.x
    }
    if (point.x < 0) this.data.cutArea.left = 0

    this.setData({
      lastPoint: this.data.currentPoint,
      currentPoint: point,
    })
    let currentLine = this.data.currentLine
    currentLine.unshift({
      time: new Date().getTime(),
      dis: this.distance(this.data.currentPoint, this.data.lastPoint),
      x: point.x,
      y: point.y,
    })
    // this.setData({
    //   currentLine
    // })
    this.pointToLine(currentLine)
  },
  // 笔迹结束
  uploadScaleEnd(e) {
    if (e.type != 'touchend') return 0
    let point = {
      x: e.changedTouches[0].x,
      y: e.changedTouches[0].y,
    }
    this.setData({
      lastPoint: this.data.currentPoint,
      currentPoint: point,
    })
    let currentLine = this.data.currentLine
    currentLine.unshift({
      time: new Date().getTime(),
      dis: this.distance(this.data.currentPoint, this.data.lastPoint),
      x: point.x,
      y: point.y,
    })
    // this.setData({
    //   currentLine
    // })
    if (currentLine.length > 2) {
      var info = (currentLine[0].time - currentLine[currentLine.length - 1].time) / currentLine.length
      //$("#info").text(info.toFixed(2));
    }
    //一笔结束，保存笔迹的坐标点，清空，当前笔迹
    //增加判断是否在手写区域；
    this.pointToLine(currentLine)
    var currentChirography = {
      lineSize: this.data.lineSize,
      lineColor: this.data.lineColor,
    }
    var chirography = this.data.chirography
    chirography.unshift(currentChirography)
    this.setData({
      chirography,
    })
    var linePrack = this.data.linePrack
    linePrack.unshift(this.data.currentLine)
    this.setData({
      linePrack,
      currentLine: [],
    })
  },

  retDraw() {
    this.data.ctx.clearRect(0, 0, 700, 730)
    this.data.ctx.draw()

    //设置canvas背景
    this.setCanvasBg('#fff')
  },

  //画两点之间的线条；参数为:line，会绘制最近的开始的两个点；
  pointToLine(line) {
    this.calcBethelLine(line)
    return
  },
  //计算插值的方式；
  calcBethelLine(line) {
    if (line.length <= 1) {
      line[0].r = this.data.radius
      return
    }
    let x0,
      x1,
      x2,
      y0,
      y1,
      y2,
      r0,
      r1,
      r2,
      len,
      lastRadius,
      dis = 0,
      time = 0,
      curveValue = 0.5
    if (line.length <= 2) {
      x0 = line[1].x
      y0 = line[1].y
      x2 = line[1].x + (line[0].x - line[1].x) * curveValue
      y2 = line[1].y + (line[0].y - line[1].y) * curveValue
      //x2 = line[1].x;
      //y2 = line[1].y;
      x1 = x0 + (x2 - x0) * curveValue
      y1 = y0 + (y2 - y0) * curveValue
    } else {
      x0 = line[2].x + (line[1].x - line[2].x) * curveValue
      y0 = line[2].y + (line[1].y - line[2].y) * curveValue
      x1 = line[1].x
      y1 = line[1].y
      x2 = x1 + (line[0].x - x1) * curveValue
      y2 = y1 + (line[0].y - y1) * curveValue
    }
    //从计算公式看，三个点分别是(x0,y0),(x1,y1),(x2,y2) ；(x1,y1)这个是控制点，控制点不会落在曲线上；实际上，这个点还会手写获取的实际点，却落在曲线上
    len = this.distance({ x: x2, y: y2 }, { x: x0, y: y0 })
    lastRadius = this.data.radius
    for (let n = 0; n < line.length - 1; n++) {
      dis += line[n].dis
      time += line[n].time - line[n + 1].time
      if (dis > this.data.smoothness) break
    }
    this.setData({
      radius: Math.min((time / len) * this.data.pressure + this.data.lineMin, this.data.lineMax) * this.data.lineSize,
    })
    line[0].r = this.data.radius
    //计算笔迹半径；
    if (line.length <= 2) {
      r0 = (lastRadius + this.data.radius) / 2
      r1 = r0
      r2 = r1
      //return;
    } else {
      r0 = (line[2].r + line[1].r) / 2
      r1 = line[1].r
      r2 = (line[1].r + line[0].r) / 2
    }
    let n = 5
    let point = []
    for (let i = 0; i < n; i++) {
      let t = i / (n - 1)
      let x = (1 - t) * (1 - t) * x0 + 2 * t * (1 - t) * x1 + t * t * x2
      let y = (1 - t) * (1 - t) * y0 + 2 * t * (1 - t) * y1 + t * t * y2
      let r = lastRadius + ((this.data.radius - lastRadius) / n) * i
      point.push({ x: x, y: y, r: r })
      if (point.length == 3) {
        let a = this.ctaCalc(point[0].x, point[0].y, point[0].r, point[1].x, point[1].y, point[1].r, point[2].x, point[2].y, point[2].r)
        a[0].color = this.data.lineColor
        // let bethelPoint = this.data.bethelPoint;
        // console.log(a)
        // console.log(this.data.bethelPoint)
        // bethelPoint = bethelPoint.push(a);
        this.bethelDraw(a, 1)
        point = [{ x: x, y: y, r: r }]
      }
    }
    this.setData({
      currentLine: line,
    })
  },
  //求两点之间距离
  distance(a, b) {
    let x = b.x - a.x
    let y = b.y - a.y
    return Math.sqrt(x * x + y * y)
  },
  ctaCalc(x0, y0, r0, x1, y1, r1, x2, y2, r2) {
    let a = [],
      vx01,
      vy01,
      norm,
      n_x0,
      n_y0,
      vx21,
      vy21,
      n_x2,
      n_y2
    vx01 = x1 - x0
    vy01 = y1 - y0
    norm = Math.sqrt(vx01 * vx01 + vy01 * vy01 + 0.0001) * 2
    vx01 = (vx01 / norm) * r0
    vy01 = (vy01 / norm) * r0
    n_x0 = vy01
    n_y0 = -vx01
    vx21 = x1 - x2
    vy21 = y1 - y2
    norm = Math.sqrt(vx21 * vx21 + vy21 * vy21 + 0.0001) * 2
    vx21 = (vx21 / norm) * r2
    vy21 = (vy21 / norm) * r2
    n_x2 = -vy21
    n_y2 = vx21
    a.push({ mx: x0 + n_x0, my: y0 + n_y0, color: '#1A1A1A' })
    a.push({ c1x: x1 + n_x0, c1y: y1 + n_y0, c2x: x1 + n_x2, c2y: y1 + n_y2, ex: x2 + n_x2, ey: y2 + n_y2 })
    a.push({ c1x: x2 + n_x2 - vx21, c1y: y2 + n_y2 - vy21, c2x: x2 - n_x2 - vx21, c2y: y2 - n_y2 - vy21, ex: x2 - n_x2, ey: y2 - n_y2 })
    a.push({ c1x: x1 - n_x2, c1y: y1 - n_y2, c2x: x1 - n_x0, c2y: y1 - n_y0, ex: x0 - n_x0, ey: y0 - n_y0 })
    a.push({ c1x: x0 - n_x0 - vx01, c1y: y0 - n_y0 - vy01, c2x: x0 + n_x0 - vx01, c2y: y0 + n_y0 - vy01, ex: x0 + n_x0, ey: y0 + n_y0 })
    a[0].mx = a[0].mx.toFixed(1)
    a[0].mx = parseFloat(a[0].mx)
    a[0].my = a[0].my.toFixed(1)
    a[0].my = parseFloat(a[0].my)
    for (let i = 1; i < a.length; i++) {
      a[i].c1x = a[i].c1x.toFixed(1)
      a[i].c1x = parseFloat(a[i].c1x)
      a[i].c1y = a[i].c1y.toFixed(1)
      a[i].c1y = parseFloat(a[i].c1y)
      a[i].c2x = a[i].c2x.toFixed(1)
      a[i].c2x = parseFloat(a[i].c2x)
      a[i].c2y = a[i].c2y.toFixed(1)
      a[i].c2y = parseFloat(a[i].c2y)
      a[i].ex = a[i].ex.toFixed(1)
      a[i].ex = parseFloat(a[i].ex)
      a[i].ey = a[i].ey.toFixed(1)
      a[i].ey = parseFloat(a[i].ey)
    }
    return a
  },
  bethelDraw(point, is_fill, color) {
    let ctx = this.data.ctx
    ctx.beginPath()
    ctx.moveTo(point[0].mx, point[0].my)
    if (undefined != color) {
      ctx.setFillStyle(color)
      ctx.setStrokeStyle(color)
    } else {
      ctx.setFillStyle(point[0].color)
      ctx.setStrokeStyle(point[0].color)
    }
    for (let i = 1; i < point.length; i++) {
      ctx.bezierCurveTo(point[i].c1x, point[i].c1y, point[i].c2x, point[i].c2y, point[i].ex, point[i].ey)
    }
    ctx.stroke()
    if (undefined != is_fill) {
      ctx.fill() //填充图形 ( 后绘制的图形会覆盖前面的图形, 绘制时注意先后顺序 )
    }
    ctx.draw(true)
  },
  selectColorEvent(event) {
    console.log(event)
    var color = event.currentTarget.dataset.colorValue
    var colorSelected = event.currentTarget.dataset.color
    this.setData({
      selectColor: colorSelected,
      lineColor: color,
    })
  },

  //将Canvas内容转成 临时图片 --> cb 为回调函数 形参 tempImgPath 为 生成的图片临时路径
  canvasToImg(cb) {
    //这种写法移动端 出不来

    this.data.ctx.draw(true, () => {
      wx.canvasToTempFilePath({
        canvasId: 'handWriting',
        fileType: 'png',
        quality: 1, //图片质量
        success(res) {
          // console.log(res.tempFilePath, 'canvas生成图片地址');

          wx.showToast({
            title: '执行了吗？',
          })

          cb(res.tempFilePath)
        },
      })
    })
  },

  //完成
  subCanvas() {
    let _this = this
    this.data.ctx.draw(true, () => {
      wx.canvasToTempFilePath({
        canvasId: 'handWriting',
        fileType: 'png',
        quality: 1, //图片质量
        success: res => {
          let pages = getCurrentPages()
          let prevPage = pages[pages.length - 2] //上一个页面
          //直接调用上一个页面的setData()方法，把数据存到上一个页面中去
          if (this.data.state == 'comUrl') {
            //不需要页面更新

            _this.setData({ loading: true })
            wx.uploadFile({
              url: 'https://dy.microzl.com/sq-smart-campus-api/xt-system/sysfile/uploadFile', // 仅为示例，非真实的接口地址
              filePath: res.tempFilePath,
              name: 'file',
              header: {
                'Content-Type': 'multipart/form-data',
                Authorization: 'Bearer ' + wx.getStorageSync('token'),
              },

              success(res) {
                let data = JSON.parse(res.data)

                let img = data.data.fUrl

                console.log(img)
                prevPage.setData({ 'info.comUrl': img })
                prevPage.setData({ comUrl: img })
                prevPage.setData({ editComUrl: true }) //企业签名状态
                _this.setData({ loading: false })
                wx.navigateBack({
                  delta: 1, //返回上一级页面
                })
              },
              fail(err) {
                _this.setData({ loading: false })
                console.log(object)
              },
            })

            // prevPage.setData({ 'info.comUrl': res.tempFilePath })
            // prevPage.setData({ comUrl: res.tempFilePath })
            // prevPage.setData({ editComUrl: true }) //企业签名状态
          }
          if (this.data.state == 'checkUrl') {
            _this.setData({ loading: true })
            wx.uploadFile({
              url: 'https://dy.microzl.com/sq-smart-campus-api/xt-system/sysfile/uploadFile', // 仅为示例，非真实的接口地址
              filePath: res.tempFilePath,
              name: 'file',
              header: {
                'Content-Type': 'multipart/form-data',
                Authorization: 'Bearer ' + wx.getStorageSync('token'),
              },

              success(res) {
                let data = JSON.parse(res.data)

                let img = data.data.fUrl

                console.log(img)
                prevPage.setData({ 'info.checkUrl': img })
                prevPage.setData({ checkUrl: img })
                prevPage.setData({ editAdmUrl: true }) //排查人签名状态
                _this.setData({ loading: false })
                wx.navigateBack({
                  delta: 1, //返回上一级页面
                })
              },
              fail(err) {
                _this.setData({ loading: false })
                console.log(object)
              },
            })

            // prevPage.setData({ 'info.checkUrl': res.tempFilePath })
            // prevPage.setData({ checkUrl: res.tempFilePath })
            // prevPage.setData({ editAdmUrl: true }) //排查人签名状态
          }

          // wx.navigateBack({
          //   delta: 1, //返回上一级页面
          // })
        },

        //           // wx.showModal({
        //           //   title: '哈哈啊',
        //           //   content: '这是什么',
        //           // })

        //           // wx.showToast({
        //           //   title: '以保存',
        //           // })

        //           //保存到系统相册
        //           /*
        // 					wx.saveImageToPhotosAlbum({
        // 						filePath: res.tempFilePath,
        // 						success(res) {

        // 							console.log(res,'保存res');

        // 							wx.showToast( {
        // 								title: '已成功保存到相册',
        // 								duration: 2000
        // 							} );

        // 						}
        // 					})
        // */
        //         },
      })
    })
  },

  //保存到相册
  saveCanvasAsImg() {
    console.log(1212)

    /*
		this.canvasToImg( tempImgPath=>{
			// console.log(tempImgPath, '临时路径');

			wx.saveImageToPhotosAlbum({
				filePath: tempImgPath,
				success(res) {

					wx.showToast({
						title: '已保存到相册',
						duration: 2000
					});

				}
			})

		} );
*/

    wx.canvasToTempFilePath({
      canvasId: 'handWriting',
      fileType: 'png',
      quality: 1, //图片质量
      success(res) {
        // console.log(res.tempFilePath, 'canvas生成图片地址');
        wx.saveImageToPhotosAlbum({
          filePath: res.tempFilePath,
          success(res) {
            wx.showToast({
              title: '已保存到相册',
              duration: 2000,
            })
          },
        })
      },
    })
  },

  //预览
  previewCanvasImg() {
    wx.canvasToTempFilePath({
      canvasId: 'handWriting',
      fileType: 'jpg',
      quality: 1, //图片质量
      success(res) {
        // console.log(res.tempFilePath, 'canvas生成图片地址');

        wx.previewImage({
          urls: [res.tempFilePath], //预览图片 数组
        })
      },
    })

    /*	//移动端出不来  ^~^！！

		this.canvasToImg( tempImgPath=>{

			wx.previewImage({
				urls: [tempImgPath], //预览图片 数组
			})


		} );

*/
  },

  //上传
  uploadCanvasImg() {
    // console.log(999);

    wx.canvasToTempFilePath({
      canvasId: 'handWriting',
      fileType: 'png',
      quality: 1, //图片质量
      success(res) {
        // console.log(res.tempFilePath, 'canvas生成图片地址');

        //上传
        wx.uploadFile({
          url: 'https://example.weixin.qq.com/upload', // 仅为示例，非真实的接口地址
          filePath: res.tempFilePath,
          name: 'file_signature',
          formData: {
            user: 'test',
          },
          success(res) {
            const data = res.data
            // do something
          },
        })
      },
    })
  },

  //设置canvas背景色  不设置  导出的canvas的背景为透明
  //@params：字符串  color
  setCanvasBg(color) {
    console.log(999)
    /* 将canvas背景设置为 白底，不设置  导出的canvas的背景为透明 */
    //rect() 参数说明  矩形路径左上角的横坐标，左上角的纵坐标, 矩形路径的宽度, 矩形路径的高度
    //这里是 canvasHeight - 4 是因为下边盖住边框了，所以手动减了写
    this.data.ctx.rect(0, 0, this.data.canvasWidth, this.data.canvasHeight - 4)
    // ctx.setFillStyle('red')
    this.data.ctx.setFillStyle(color)
    this.data.ctx.fill() //设置填充
    this.data.ctx.draw() //开画
  },

  /*======所有自定义函数=END=====*/

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    let canvasName = this.data.canvasName
    let ctx = wx.createCanvasContext(canvasName)
    this.setData({
      ctx: ctx,
    })
    var query = wx.createSelectorQuery()
    query
      .select('.handCenter')
      .boundingClientRect(rect => {
        this.setData({
          canvasWidth: rect.width,
          canvasHeight: rect.height,
        })

        /* 将canvas背景设置为 白底，不设置  导出的canvas的背景为透明 */
        // console.log(this, 'hahah');
        this.setCanvasBg('#fff')
      })
      .exec()

    console.log(options.state)
    this.setData({ state: options.state })
  },

  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady: function () {},

  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function () {},

  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function () {},

  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function () {},

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {},

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function () {},

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function () {},
})
